Global Warming May Cause Widespread Water Shortages, Studies Say

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In addition to the western United States and Canada, hard-hit regions include parts of Europe, South America west of the Andes, and much of central Asia from northern India across to China and Russia.

About one-sixth of the world's population—more than a billion people—inhabit these areas. The regions at risk also account for about a quarter of the world's economic output.

"What are those people going to do?" Barnett asked. "Just sit there and be thirsty and watch their crops die?"

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